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. 2019 Aug 1;9(8):e027193. doi: 10.1136/bmjopen-2018-027193

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© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Echocardiography view. (A) Apical four-chamber view for right atrial and ventricular dimension and (B) right ventricular fractional area change. Yellow area: RV end-diastolic area; red area: RV end-systolic area. $\begin{array}{ll} R i g h t V e n t r i c u l a r F r a c t i o n a l A r e a C h a n g e (%) \\ = 100 \times \frac{R V e n d d i a s t o l i c a r e a - R V e n d s y s t o l i c a r e a}{R V e n d d i a s t o l i c a r e a} \end{array}$ . LA, left atrial; LV, left ventricular; RA, right atrial; RV, right ventricular.